Prostitution in Portugal is legal, but it is illegal for a third party to profit from, promote, encourage or facilitate the prostitution of another. Consequently organized prostitution (brothels, prostitution rings or other forms of pimping) is prohibited.
Although the number of workers involved in the industry is notoriously difficult to estimate, in the mid-2000s, the number of female prostitutes was estimated at 28,000, of whom at least 50% were foreigners.

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Oct 19, 2012 ... Portugal's NGOs say more women of all ages are resorting to sex ... increase in the number of women of all ages resorting to prostitution, ... from school dropouts to university graduates, often those married and with children.

University of Heidelberg, Heidelberg, Germany ... This paper investigates the impact of legalized prostitution on human trafficking inflows. ...... Dummies for English, French, Spanish, Portuguese, and German speaking countries, as well.

PORTUGAL Prostitution in Portugal is not covered by a specific law, and it is
tolerated on an individually-organized basis. Pimpingand running brothels are
illegal activities. [1] Several other prostitution-related activities are also outlawed
and ...

Peter de Marneffe Professor of Philosophy Arizona State University, 2009

For the view that there has been little change in attitudes toward Prostitution in Portugal since 1982, when it was decriminalized, see Gilbert Geis, “Portugal,” in
Davis, ed., Prostitution, pp. 225–242, at p. 240. For the observation that
prostitution ...

men are prostitutes, does that mean that one Portuguese prostitute implies that
all Portuguese women are prostitutes as well? What differentiates the two is that
Brazilian prostitutes are illegal here and when they get arrested the whole
country ...

See also:
- Pentagon Declined To Investigate Hundreds Of Purchases Of Child Pornography
Portuguese TV presenter among six convicted over child prostitution at Casa Pia state-run orphanages
Portuguese TV presenter Carlos Cruz, who paid for sex with a 14-year-old boy, the court was told. Photograph: Tiago Petinga/EPA
One of Portugal’s most famous television presenters and a former ambassador were among six men found guilty yesterday of involvement with a paedophile prostitution ring that exploited children from state-run orphanages.

Spanish police said Monday it had smashed two rival Chinese rings that brought women from China, some of them minors, to Spain with the promise of high paying jobs and then forced them into prostitution.

I've done the research for those of you concerned about Legal Portugese sexual practices "Prostitution in Quarteira has been steadily rising over the past years, mainly due to the influx of immigrant women from Eastern Europe, Brazil and Africa.